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Multiplexer-related

Selectable-differential-or-single-ended-mode-bus

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Selectable differential or single-ended mode bus

Details

Inventors: Lattimore, George McNeil; Reese, Robert James; Yeung, Gus Wai-Yan;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Beausoleil; Robert
Assistant Examiner: Chung-Trans; X.
Attorney, Agent or Firm: Van Leeuwen; Leslie A.

A bus may be configured as either a single-ended mode bus or as a differential mode bus, depending on the system environment. The bus is configured in such a way that additional lines are not required, and so that substantially the same circuitry may be used for either single-ended mode or differential mode. Further, a selectable-mode driver may be connected to a non-selectable mode receiver, and vice versa. The invention may be implemented as a selectable driver, a selectable receiver, or a selectable driver/receiver pair. The apparatus and method of the present invention apply to both uni-directional and bi-directional bus implementations. The invention uses the same bus lines (i.e. wires) and substantially the same circuitry for both single-ended and differential modes of operation. When operating in single-ended mode, the data width of the bus is twice the data width as when operating in differential mode.

DETAILED DESCRIPTION Accordingly, the present invention is directed to a method and apparatus for configuring a bus as either a single-ended mode bus or as a differential mode bus, depending on the system environment.
The bus is configured in such a way that additional lines are not required, and so that substantially the same circuitry may be used for either single-ended mode or differential mode.
Further, a selectable-mode driver may be connected to a non-selectable mode receiver, and vice versa.
The present invention may be implemented as a selectable driver, a selectable receiver, or a selectable driver/receiver pair.
The apparatus and method of the present invention apply to both uni-directional and bi-directional bus implementations.
The invention uses the same bus lines (i.
e.
wires) and substantially the same circuitry for both single-ended and differential modes of operation.
When operating in single-ended mode, the data width of the bus is twice the data width as when operating in differential mode.

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